根据下面资料，回答题 I′veoftenwonderedhowexactlysleep,orlackofit,canhavesuchanawfuleffectonourbodiesand,guesswhat,howmuchwesleepswitchesgoodgenesonandbadgenesoff. Inthefirsthalfof2013,theSleepResearchCentreattheUniversityofSurreyfoundadirectlinkbetweenhoursspentsleepingandgenes.EverycellinourbodiescarriesgeneticinstructionsinourDNAthatactasakindofoperatinghandbook.However,eachcellonly"reads"thepartofthishandbookitneedsatanygivenmoment. CansleepaffecthowagenereadsinstructionsIt′saquestionaskedbyProfessorDerk-JanDijkattheUniversityofSurrey.Hesetupanexperimentandaskedhisvolunteerstospendaweeksleepingaroundsevenandahalfhourstoeighthoursanightandthenextsleepingsixandahalftosevenhours. Bloodsamplesweretakeneachweektocomparewhichgenesinbloodcellswerebeingusedduringthelongandshortnights.Theresultswererathersurprising.Severalhundredgeneschangedintheamounttheywerebeingused,includingsomethatarelinkedtoheartdisease,cancer,andType2diabetes.Genestodowithcellrepairandreplacementwereusedmuchless. Sleeprestriction(sixandahalftosevenhoursanight)changed380genes.Ofthese,220genesweredownregulated(theirpowerwasreduced),while160wereupregulated(theirpowerwasincreased).Thoseaffectedincludedbody-clockgeneswhicharelinkedtodiabetes.Oneofthemostdowngradedgenesisthatwhichhasaroleincontrollinginsulinandislinkedtodiabetesandinsomnia.Themostupgradedgeneislinkedtoheartdisease. Sochangingsleepbytinyamountscanupgradeordowngradegenesthatcaninfluenceourhealthandthediseaseswesufferfromwhenwesleeptoolittle. Theimportantmessageisthatgettingclosetoeighthoursofsleepanightcanmakeadramaticdifferencetoourhealthinjustafewdaysthroughthewayitlooksafterourgenes. Whatkindofrelationisdirectlydiscussedinthepassage查看材料
A.Sleeping hours and changes of genes. B.Sleeping hours and diseases. C.Changes of genes and diseases. D.Genes and health.正确答案A
